Stator for reciprocating motor

ABSTRACT

A stator of a reciprocal motor includes a bobbin of insulating material with a coil wound thereon, a terminal unit formed integrally with the bobbin to connect the coil to an external power source, a first lamination core in which a plurality of lamination sheets of a predetermined form are stacked radially along the bobbin, and a second lamination core in which a plurality of lamination sheets formed to have a certain width and length and located symmetrically on the central line in the direction of the length, are coupled with the inner side or outer side of the first lamination core. Therefore the present invention makes the laminating operation simple and convenient by laminating the plurality of lamination sheets composing the laminate core without sorting the lamination sheets in a certain direction during the production of the lamination core thus to improve assembly productivity and mass productivity.

This application is the national phase under 35 U.S.C. §371 of PCTInternational Application No. PCT/KR01/00866 which has an Internationalfiling date of May 24, 2001, which designated the United States ofAmerica.

TECHNICAL FIELD

The present invention relates to a stator for a reciprocating motor, andparticularly, to a stator for a reciprocating motor of which componentscan be fabricated in simple way.

BACKGROUND ART

Generally, a motor is a device for changing electric energy into kineticenergy, and can be classified into a rotary motor changing the electricenergy into rotating movements and a reciprocating motor changing theelectric energy into linear reciprocating movements.

The motor can be used in various fields as a power source. Especially,the above motor is applied to most electric devices such asrefrigerator, air conditioner, etc.

In the refrigerator and the air conditioner, the motor is used to rotatea blast fan, however, it can be also used as a power source by beingmounted on a compressor of cooling cycle device included in therefrigerator and the air conditioner.

FIGS. 1 and 2 are showing an example of a reciprocating motor underdevelopment by the present applicant. As shown therein, thereciprocating motor comprises: a bobbin 100 of ringular shape having acoil 110 wound therein; a terminal portion formed on one side of thebobbin 100 for electrically connecting the coil 110 wound in the bobbin110 to outer electric source; an outer core 200 in which a plurality oflamination sheets 210 which are thin plates of U-shape are laminated inradial direction so as to make a cylindrical shape centering around thebobbin 100; an inner core 300, in which a plurality of lamination sheets310 having predetermined area and length, and having asymmetric upperand lower parts centering around length direction are laminated inradial direction so as to make a cylinder shape, inserted into the outercore 200; and an armature 400 inserted between the outer core 200 andthe inner core 300.

The outer core 200 and the inner core 300 including the bobbin 100construct a stator (S).

On the other hand, the inner core 300 may be located on an outer side ofthe outer core 200. That is, the bobbin 100 is located on the inner core300 side, and the bobbin 100 may not be included in the outer core 200.

The lamination sheets 210 constructing the outer core 200 are laminatedso that the bobbin 100 can be inserted into opening recess (H) formedinside of the lamination sheet 210. In addition, both ends of thelamination sheet 210 are pole portion 211 forming the poles, andremained part is path portion 212 on which flux flows.

The lamination sheet 310 constructing the inner core 300 is formed tohave long portion facing the lamination sheet 210 of the outer core 200,short opposite portion, and coupling recesses 311 with opened endsformed on both end portions of the lamination sheet.

The armature 400 comprises a magnet holder 410 of cylindrical shape anda plurality of permanent magnets 420 fixedly coupled on an outercircumferential surface of the magnet holder 410.

In addition, as shown in FIG. 3, a laminated body (L) which is made bylaminating the plurality of lamination sheets 310 in radial direction tomake a cylinder shape is fixedly coupled by press-fitting a fixing ring312 of ringular shape into a ring coupled recess 311 of ringular shapeformed by a concave recess of the lamination sheets.

Unexplained reference numeral 220 represents a fixing ring of the outercore.

As shown in FIG. 4, when electric current is flowed on the winding coil110, a flux is formed around the winding coil 110 by the electriccurrent flowing on the winding coil 110, and the flux flows along withthe outer core 200 and the inner core 300 as forming a closed loop.

The armature 400 is moved toward a center axis direction by aninteraction between the flux caused by the current flowing on thewinding coil 110 and the permanent magnet 420 constructing the armature400.

In addition, when the direction of electric current flowing on thewinding coil 110 is changed, the direction of the flux formed on theouter core 200 and the inner core 300, and the armature 400 moves towardopposite direction.

When the electric current is supplied as changing its direction, thearmature 400 undergoes linear reciprocating movements between the outercore 200 and the inner core 300. Accordingly, the armature 400 is tohave linear reciprocating power.

On the other hand, since the outer core 200 and the inner core 300making the stator (S) are constructed by the laminated body of theplurality of lamination sheets, the loss of flux flowing on the statorcan be reduced.

However, according to the above conventional structure, when the stator(S) is fabricated, the lamination sheet 310 constructing the inner core300 in the stator (S) is formed as an asymmetric shape for a center linein length direction, and therefore, the directions of the laminationsheets 310 should be coincided and laminated in laminating the pluralityof lamination sheets 310 as a cylinder shape. Thus, the laminatingoperation is complex, and productivity is lowered and it is not suitablefor mass production.

TECHNICAL GIST OF THE PRESENT INVENTION

Therefore, an object of the present invention is to provide a stator fora reciprocating motor of which components can be fabricated in simpleway and assembling property can be improved.

In order to achieve the above objects, there is provided a stator for areciprocating motor comprising: a bobbin of insulating material on whicha coil is wound; a terminal portion formed integrally with the bobbinfor electrically connecting the coil to outer electric source a firstlamination core in which a plurality of lamination sheets formed as thinplates of predetermined shape are laminated in radial direction alongwith the bobbin; and a second lamination core, in which a plurality oflamination sheets formed to have predetermined area and length andformed to have symmetric upper and lower sides for a center line oflength direction are laminated in radial direction to make a cylindershape, coupled to the first lamination core to be located on inner orouter side of the first lamination core.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front cross-sectional view showing a reciprocating motorunder development;

FIG. 2 is a side view showing the reciprocating motor under development;

FIG. 3 is a perspective view showing an inner core constructing thereciprocating motor under development;

FIG. 4 is a front cross-sectional view showing operational status of thereciprocating motor under development;

FIG. 5 is a front cross-sectional view showing a reciprocating motorincluding a stator according to the present invention;

FIG. 6 is a perspective view showing the stator of the reciprocatingmotor according to the present invention;

FIG. 7 is a front view showing another example of a lamination sheetconstructing the stator of the reciprocating motor according to thepresent invention; and

FIG. 8 is a cross-sectional view showing another embodiment of thereciprocating motor according to the present invention.

MODE FOR CARRYING OUT THE PREFERRED EMBODIMENTS

The present invention will now be described with reference toaccompanying drawings.

FIG. 5 shows a reciprocating motor including an embodiment of a statoraccording to the present invention. As shown therein, in thereciprocating motor, a terminal portion 520 for electrically connectinga coil 510 to outer electric source is formed integrally on aninsulating bobbin 500 on which a coil 510 is wound.

In addition, a first lamination core 600 is coupled to outer side of thebobbin 500, and the first lamination core 600 is a laminated body inwhich a plurality of lamination sheets 610 formed as thin plates ofU-shape are laminated in radial direction along with the bobbin 500.

The plurality of lamination sheets 610 constructing the first laminationcore 600 are laminated from one side surface of the terminal portion 520to another side surface of the terminal portion 520 so that the bobbin500 can be inserted into an opened recess (H) formed in the laminationsheets 610. In addition, both ends of the lamination sheets 510 become apole portion 611, and remained part becomes a path portion 612 on whichthe flux flows.

In addition, a second lamination core 700 is inserted into the firstlamination core 600 with a predetermined gap therebetween.

As shown in FIG. 6, the second lamination core 700 comprises a laminatedbody L′ which is made by laminating a plurality of lamination sheets710, of which upper and lower sides are formed to have symmetricstructure for center line in length direction, in radial direction tomake a cylinder shape, and a fixing ring 720 for fixing the laminatedbody L′.

Also, the lamination sheet 710 constructing the second lamination core700 is formed to have symmetric structure in left-and-right sides basedon a vertical center line for the length direction.

The lamination sheet 710 constructing the second lamination core 700 ismade by forming a square plate body portion 711 of rectangular shapehaving a predetermined area and length, and forming ring insertionrecesses 712 having predetermined width and depth on both ends of acenter line in length direction of the square plate body portion 711.

The lamination sheets 710 are laminated in radial direction to make acylindrical shape, and after that, the fixing ring 720 of ringular shapeis press-fitted into a recess of ringular shape formed by the ringinsertion recesses 712 of the plurality of lamination sheets 710.

Also, as another example of the second lamination core 700, thelamination sheet 730 may be formed by a square plate body portion 731 ofrectangular shape having a predetermined area and length, ring insertionrecesses 732 formed on both ends of a center in length direction of thesquare plate body portion 731 to have a predetermined width and depth,and a cut recesses 733 formed on upper and lower sides of the ringinsertion recesses 732 respectively to make corners of the square platebody portion 731 be acute angles, as shown in FIG. 7. It is desirablethat the cut recesses 733 are formed as triangles.

In addition, an armature 800 is inserted between the first laminationcore 600 and the second lamination core 700. The armature 800 comprisesa magnet holder 810 formed as a cylinder and a plurality of permanentmagnets 820 fixedly coupled on an outer circumferential surface of themagnet holder 810.

Also, as another embodiment of the present invention, the stator for thereciprocating motor comprises: a bobbin 500 of insulating material onwhich a coil 510 is wound; a terminal portion 520 formed integrally withthe bobbin 500 for electrically connecting the coil 510 to outerelectric source; a first lamination core 600 in which a plurality oflamination sheets 510 formed as thin plates of predetermined shapes arelaminated in radial direction along with the bobbin 500; and a secondlamination core 700, in which a plurality of lamination sheets 710having predetermined area and length and having symmetric structure inup-and-down direction for a center line of length direction arelaminated in radial direction to make a cylinder shape, coupled to thefirst lamination core 600 to be located on outer side of the firstlamination core 600, as shown in FIG. 8.

That is, the first lamination core 600 is inserted into the secondlamination core 700 with a predetermined gap therebetween.

Also, left and right sides of the lamination sheet 710 constructing thesecond lamination core 700 is formed to be symmetric based on a verticalcenter line for the length direction.

That is, the lamination sheet 710 constructing the second laminationcore 700 is formed by a square plate body portion 711 of rectangularshape having predetermined area and length, and by ring insertionrecesses 712 having a predetermined width and depth formed on both endsof the center in length direction of the square plate body portion 711.

In addition, the armature 800 is inserted between the first laminationcore 600 and the second lamination core 700.

Hereinafter, operation and effect of the stator for the reciprocatingmotor will be described as follows.

When the electric current is flowed on the winding coil 510 located inthe bobbin 500, the flux flows along with the first lamination core 600and the second lamination core 700 by the current flowing on the windingcoil 510 as forming a closed loop.

The armature is moved toward the center axis by an interaction betweenthe flux caused by the electric current flowing on the winding coil 510and the permanent magnets 820 constructing the armature 800.

In addition, when direction of the electric current flowing on thewinding coil 510 is changed, direction of the flux formed on the firstlamination core 600 and the second lamination core 700 is changed, andtherefore, the permanent magnets 820 are moved toward oppositedirection.

As described above, when the electric current is supplied as changingits direction, the armature 800 undergoes linear reciprocating movementsbetween the first lamination core 600 and the second lamination core700.

On the other hand, since the plurality of lamination sheets 710constructing the second lamination core 700 are formed to have symmetricstructure in up-and-down, and left-and-right directions on the basis ofthe center line in length direction, the lamination sheets 710 do nothave directional property when the sheets are laminated in radialdirection, and therefore, the lamination sheets 710 can be laminatedwithout arranging them in a predetermined direction.

In addition, in case of the second lamination core 700 in which aplurality of lamination sheets 730 having cut recesses 733 are laminatedshown in FIG. 7, the flow of flux which is induced through the poleportion 611 of the first lamination core 611 can be smooth due to theform property.

INDUSTRIAL APPLICABILITY

As so far described, according to the stator for reciprocating motor ofthe present invention, a plurality of lamination sheets constructing theradial laminated body are constructed so that the upper and lower sidesof the sheets are symmetric for the center line in length direction, andtherefore, the plurality of lamination sheets can be laminated withoutarranging them toward a certain direction. Thus, the laminatingoperation can be made simply and conveniently to improve the assemblingproductivity, and to increase mass productivity.

What is claimed is:
 1. A stator for a reciprocating motor comprising: abobbin of insulating material on which a coil is wound; a terminalportion formed integrally with the bobbin for electrically connectingthe coil to an external electric source; a first lamination core havinga plurality of lamination sheets formed as thin plates withpredetermined shapes are laminated in a radial direction along with thebobbin; and a second lamination core having a plurality of laminationsheets, wherein each sheet of said lamination sheets of said secondlamination core have a predetermined area and length, and a symmetricstructure with respect to an up-and-down direction of an axialcenterline of said stator, said lamination sheets of said secondlamination core being laminated in a radial direction to form acylindrical shape and being coupled to the first lamination core to belocated on an inner or an outer side of the first lamination core. 2.The stator according to claim 1, wherein upper and lower sides of thelamination sheets constructing the second lamination core are formed tobe symmetric based on a vertical center line with respect to a lengthdirection.
 3. The stator according to claim 1, wherein the laminationsheets of the second lamination core are each formed by forming a squareplate body portion of rectangular shape having a predetermined area andlength, and by forming ring insertion recesses having a predeterminedwidth and depth on both ends of the square plate body portion at anaxial center of the square plate body portion.
 4. The stator accordingto claim 1, wherein the lamination sheets of the second lamination coreeach include a square plate body portion of rectangular shape having apredetermined area and length, ring insertion recesses having apredetermined width and depth formed on both ends of the square platebody portion at an axial center center of the square plate body portion,and cut recesses formed on upper and lower sides of the ring insertionrecesses respectively for forming corners of the square plate bodyportion at acute angles.